Slide rule for navigation



FIG. 1 is a front perspective view of the slide rule showing my new design;

FIG. 2 is a rear perspective view of the slide rule of FIG. 1;

FIG. 3 is a left side perspective view of the slide rule of FIG. 1;

FIG. 4 is a right side perspective view of the slide rule of FIG. 1;

FIG. 5 is a top plan view of the slide rule of FIG. 1; and,

FIG. 6 is a bottom plan view of the slide rule of FIG. 1. 

The ornamental design for a slide rule for navigation, as shown and described. 